Flame Heights and Heat Transfer in Façade System Ventilation Cavities

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

The design of buildings using multilayer constructions poses a challenge for fire safety and needs to be understood. Narrow air gaps and cavities are common in many constructions, e.g. ventilated façade systems. In these construction systems flames can enter the cavities and fire can spread on the interior surfaces of the cavities. An experimental program was performed to investigate the influence of the cavity width on the flame heights, the fire driven upward flow and the incident heat fluxes to the inner surfaces of the cavity. The experimental setup consisted of two parallel facing non-combustible plates (0.8 × 1.8 m) and a propane gas burner placed at one of the inner surfaces. The cavity width between the plates ranged from 0.02 m to 0.1 m and the burner heat release rate was varied from 16.5 kW to 40.4 kW per m of the burner length. At least three repeated tests were performed for each scenario. In addition, tests with a single plate were performed. The flame heights did not significantly change for Q′/W < 300 kW/m2 (where Q′ is the heat release rate per unit length of the burner and W is the cavity width). For higher Q′/W ratios flame extensions up to 2.2 times were observed. When the distance between the plates was reduced or the heat release rate was increased, the incident heat fluxes to the inner surface increased along the entire height of the test setup. The results can be used for analysing methodologies for predicting heat transfer and fire spread in narrow air cavities.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • Danish Institute of Fire and Security Technology
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Annan samhällsbyggnadsteknik

Nyckelord

Originalspråkengelska
Sidor (från-till)689-713
TidskriftFire Technology
Volym54
Utgåva nummer3
Tidigt onlinedatum2018 feb 5
StatusPublished - 2018
PublikationskategoriForskning
Peer review utfördJa

Relaterad forskningsoutput

Karlis Livkiss, 2020 feb 28, Division of Fire Safety Engineering, Lund University. 133 s.

Forskningsoutput: AvhandlingDoktorsavhandling (sammanläggning)

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